Journal
JOURNAL OF MOLECULAR STRUCTURE
Volume 1137, Issue -, Pages 610-614Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molstruc.2017.02.072
Keywords
Ionic liquid; Phase transition; High pressure; Raman spectra; X-ray diffraction
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Funding
- National Science Foundation of China [21273206, 21503194, 31201377]
- Scientific Research Key Foundation of Henan Province [12B140018, 152102210143]
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In situ crystalization of 1-decyl-3-methylimidazolium tetrafluoroborate ([C10MIM][BF4]) from melt has been investigated under high pressure up to 3.4 GPa at room temperature by using Raman spectroscopy and synchrotron X-ray diffraction measurement. Raman spectral analysis indicated that [C10MIM][BF4] experienced two successive phase transitions at about 0.3 GPa and 1.6 GPa. And the polymorphism was also discussed in view of the conformational isomerism of [C10MIM](+) cation between gauche and trans conformers. Notably, liquid-crystal and crystal-crystal phase transitions were further confirmed by synchrotron X-ray diffraction measurement. Moreover, it also indicated that high structural flexibility of the cations with long alkyl chain might have effect on the degree of disorder of pressure-induced crystallization for ionic liquids. (C) 2017 Elsevier B.V. All rights reserved.
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